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Diagnostic Test

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
  1. 1)  CHECK THE EBL RELAY FOR A SHORT TO BATTERY 
    Fig 1: Checking EBL Relay For Short To Battery
    GC0028224Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Install a known good relay in place of the EBL relay.

    Turn the ignition on.

    Actuate the Clear DTC function by performing the following:

    • Turn the blower control on.
    • Press the A/C mode switch down, turn the blower control to off, wait 5 seconds and then release the A/C mode switch.
    • When the A/C status indicator begins displaying DTCs, set the Mode switch to the floor position, simultaneously press the A/C mode switch and the EBL mode switch down for 5 seconds and then release the mode switches. Stored DTCs will clear from memory in approximately two seconds.

    Press the EBL mode switch on.

    Actuate the Display DTC function by performing the following:

    • Turn the blower control on.
    • Press the A/C mode switch down, turn the blower control to off, wait 5 seconds and then release the A/C mode switch.
    NOTE: The A/C status indicator displays active DTCs when the EBL status indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated.

    Read DTCs from the A/C status indictor.

    Does the A/C status indicator display DTC 77? 

    Yes 

    1. Go To step  2).

    No 

    1. Replace the original EBL Relay in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  2. 2)  CHECK FOR A SHORTED A/C HEATER CONTROL 
    Fig 2: Checking For A Shorted A/C Heater Control
    GC0028225Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Remove the replacement EBL relay.

    Disconnect the A/C Heater Control C1 harness connector.

    Turn the ignition on.

    Measure the voltage of the (C115) Defogger Relay Control circuit.

    Is the voltage above 0.2 volts? 

    Yes 

    1. Go To step  3).

    No 

    1. Replace the A/C Heater Control in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  3. 3)  CHECK THE (C115) DEFOGGER RELAY CONTROL CIRCUIT FOR A SHORT TO BATTERY 
    Fig 3: Checking For A Shorted A/C Heater Control
    GC0028225Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the Junction Block C2 harness connector.

    Turn the ignition on.

    Measure the voltage of the (C115) Defogger Relay Control circuit.

    Is the voltage above 0.2 volts? 

    Yes 

    1. Repair the (C115) Defogger Relay Control circuit for a short to battery.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Replace the Junction Block in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
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